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Summary This paper deals with the modeling, thermodynamic analysis and comparison of irreversibility in two configurations of the double generator absorption chiller. First a computer simulation model is developed for each configuration on the basis of mass and energy balances. Simulation results were then used to analyse the entropy generation and irreversibility (or exergy destruction) of each component. It is found that the parallel flow configuration is more powerful than the serie flow configuration. Exergy losses in the parallel flow configuration are lower than that of the serie flow. The results indicate that the absorber and the solution heat exchangers have the most potential to improve the chiller energy efficiency. Also they indicate that focusing on irreversibility is more direct way of analysing the potential for improving the efficiency of ammonia-water absorption chiller.

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Abstract  

We have developed a thermogravimetric system (TG system) for condensable gas adsorption by modifying a standard thermogravimetric analyzer Cahn TG 2121 and performed isotherm measurements of water vapor adsorption on Fuji Davison type RD silica gel and ethanol vapor adsorption on Maxsorp II activated carbon. For the water vapor-silica gel data, our results compare favorably with the data reported by the manufacturer and those obtained from a volumetric method. This confirms the reliability of our TG system for adsorbents which do not swell significantly. In addition, our isotherm data also provide useful design information for the development of adsorption chillers.

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Abstract  

This article presents results of the experimental investigation on the adsorption of the water vapor on silica gel. Two independent experimental methods has been used, viz. the constant-volume-variable-pressure (CVVP) system and variable pressure thermogravimetry (TG). Results from these two methods are compared with each other. Also the isosteric heat of adsorption of this system has been determined from the equilibrium data. The silica gels investigated here are Fuji Davison type 'A' and type 'RD'. Adsorption isotherm of water vapor have been measured under a variety of conditions all referring to chiller operation cycles, i.e. temperatures from 303 to 358 K and pressures from 500 to 7000 Pa. The data collected from the two independent experiments compare very favorably with each other and their trends are consistent with those of the adsorption chiller manufacturer. This lends significant weight to our experimental data on silica gel+water systems as being valuable to the adsorption chiller manufacturers and the scientific community.

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of a solar driven absorption chiller–A dynamic approach . Energy Conversion and Management , 137 , 34 – 48 . [2] Bellos E. , Tzivanidis C

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performance of adsorption chiller driven by variable heat source under different experimental conditions [ 10 ]. They also developed an adsorption chiller and heat pump for domestic heating and air-conditioning applications [ 11 – 14 ]. Other authors [ 15

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. , Chiller , T. M. : Changes in incidence and antifungal drug resistance in candidemia: Results from population-based laboratory surveillance in Atlanta and Baltimore, 2008–2011 . Clin Infect Dis 55 , 1352 – 1361 ( 2012 ). 6

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. Collignon , P. , Powers , J. H. , Chiller , T. M. , Aidara-Kane , A. and Aarestrup , F. M. ( 2009 ): World Health Organization ranking of antimicrobials according to their importance in human medicine: a critical step for developing risk

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sense of humor . Psychological Reports , 37 ( 3 ), 1022 . S CHILLER , P. ( 1938 ). A configural theory of puzzles of jokes . Journal of General Psychology , 18 ( 2

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Orvosi Hetilap
Authors: Zoltán Mátrai, Vanda Plotár, Gabriella Liszkay, Zsuzsanna Fejős, Ágnes Vámosi, Zsolt Dubóczky, Ferenc Rényi Vámos, István Vámosi Nagy, István Köves, Alexandra Bartal, Emese Schmidt, and László Tóth

Chiller, K., Passaro, D., Scheuller, M. és mtsai: Microcystic adnexal carcinoma: forty-eight cases, their treatment, and their outcome. Arch. Dermatol., 2000, 136 , 1355–1359. Scheuller M

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thermal properties, i.e., the effective ground conductivity and borehole thermal resistance, is carried out in in-situ TRT. This method was first presented by Mogensen [ 8 ], who suggested a simple arrangement with a circulation pump, a chiller or heater

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